VIV's Glasswares are the most favored hand-blown glass pipes in the aquatic world offering an outstanding elegance to any aquarium. Designed with an emphasis on functional beauty, each VIV overflow is handmade in China by skilled glass workers. The pieces are formed from crystal clear borosilicate glass, the same material used to make high end lab equipment. Japanese glass craftsmen carefully hand finish each VIV part to the highest standards with smooth edges and attention to the smallest details. You no longer need to look at an ugly canister filter intake as VIV's Glassware enhances the look and function of your aquarium not take away from it.Use with 13 mm or 1/2' ID tubing.Intake Pipe Length is 11 inside aquarium.Use with Lily Outflow of choice.Important Info: Always wet the glass tubing before inserting the silicon or rubber tubing to avoid damaging Glassware.